Wireless receiving system



May 1, 1928.

1,667,863 D. G. LITTLE WIRELESS RECEIVING SYSTEM Filed Sept. 12, 1922 3 Sheets-Sheet 1 WITNESSES: INVENTOR Dona/d6 L/if/e 3 6 2 Rw m m n 6 q. w e h S 3 M m. Y E LG, TNZ W 2 I. LEt 0! m@ RS Bum mu EF R I w May 1, 1928.

INVENTOR Dona/0 G. Liz t/e WITNESSES:

ATTORNEY May 1, 1928.

D. G. LITTLE WIRELESS RECEIVING SYSTEM Filed Sept. 12. 1922 3 Sheets-Sheet 3 WITNESSES:

INVENTOR Dona/d GL/fl/e ATTORNEY Patented May 1, 1928.

UNlTED STATES PATENT OFFICE.

DONALD G. LITTLE, {J}? WILKINSBURG, PENIISYLVANIA, ASSIGNOE, TO WESTING- HOUSE ELECTRIC 82; MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

VIRELESS RECEIVING SYSTEM.

Application filed September 12, 19252.

My invention relates to wireless apparatus and particularly to wireless receiving sets.

One object of m invention is to provide apparatus of the c ass described embodying a simple, compact and rugged design which is suitable for inex ensive quantity-produc tion methods and comprising parts which may be made in existing machinery and may be assembled with a minimum expenditure of time and money.

Another object of my invention is to provide a novel mounting for the terminal connectors of an electrical apparatus supported as a removable unit in a cabinet.

A more specific object of my invent-ion is to provide a cabinet open in front and having perforations in the rear wall, the principal contents of the cabinet being mounted as a removable unit comprising an outer control panel serving as afront closure for the cabinet, a sub-panel supported in spaced relation from the rear surface of said control panel, translating apparatus disposed both in front of and behind said sub-panel and supported thereby, and rigid terminal. conductors supported by said sub-panel and extending adjacent to the perforations in the rear wall to admit of access from the outside of the cabinet.

A further object of my invention is to provide a radio receiving cabinet in which all the parts, including the terminal connections, are electro-statically shielded in a novel and effective manner.

With these and other objects in view, my invention further consists in the details of construction and arrangement hereinafter described and claimed. and illustrated in the accompanying drawing, wherein Figure 1 is a longitudinal sectional view of a wireless receiving set embodying my invention, the section being taken on the line 1-1 of Fig. 2;

Fig. 2 is a rear end elevational. view of the apparatus shown in Fig. 1, the rear wall being removed; and

Fig. 3 is a front elevational view showing the apparatus of the previous figures and illustrating the general arrangement of the controlling elements.

In the illustrated embodiment of my invention shown in the several figures of the drawing, a wireless receiving set is provided.

Serial No. 587,679.

comprising a cabinet 1 which is open in front and which is provided with a rear wall 3 having perfor tions 2 designed to removably receive terminal connections 4: for the set, all as hereinafter more fully set forth. A circuit arrangement suitable for the apparatus hereinafter described constitutes the subject matter of a co-pending application of Frank Conrad, Serial No. 386,323, filed June 3, 1920 and assigned to the lVestinghouse Electric & Manufacturing Company, but, as the particulars of the circuit arrangements are not essential to my present invention, a detailed description of the theory and operation thereof is deemed unnecessary.

The open end of the cabinet may be closed by means of a control panel 5 which may be removably secured in position by means of screws 6 extending through the same and into blocks 7 which are secured to the walls of the cabinet 1, as shown in the several figures. A sub-panel, 8, which is composed of bakelite or other insulating material, is car ried by the control panel 5 by means of the supporting posts 9 and is so positioned with respect to the panel 5 as to provide a relatively small space 11 therebetween and a relatively large space 12 between the subpanel 8 and the rear wall 3. A variometer 13, which is supported by the sub-panel 8 in the space 12, and a variable condenser 14, which is supported by the sub-panel 8 in the space 11, are so positioned with respect to one another that the movable elements thereof may be mounted upon a common shaft 15 which extends through the control panel 5 and terminates upon a controlling knob 16. The effect of such connection is to cause simultaneous variations in the inductance of the variometer 13 and in the capacitance of the condenser 1% upon a movement of the controlling knob 16. A vernier condenser 17 may be mounted upon the sub-panel 8 in the space 11 between the two panels. A movable element of the Vernier condenser 1'7 may be carried by a shaft 18 which terminates outside the control panel in a controlling knob 19.

The horizontally positioned rods 4:, which serve as terminal connections for the set, extend back from the sub-panel 8 adjacent to or through the several perforations 2 in the wall. 3 and are accessible from the out side of the cabinet 1. An adjusting switch 20 for providing variations in the efiective number of turns of a tickler coil (not shown) may be mounted on the sub-panel 8. A movable contact element 21 thereof may be secured to a rod 22 which terminates in a controlling knob 23 outside the control panel 5.

A shield 24: is disposed immediately adjacent to the inner surface of the main control panel 5 in order to shield the apparatus disposedat the rear thereof from the capacity effects of the operator. For the same reason, the portions of the several operating shafts, which extend to the front of the shielding plate 24, are preferably composed of an insulating material. Hence, the parts of the apparatus which carry radio-frequency currents, including the terminal connectors, are

I all disposed at the rear of the shielding plate 24 and thus the greatest possible electrostatic shielding is provided. In actual practice, I have found that the shielding justdescribed makes possible the reception of undamped waves upon extremely short wave lengths.

lVhile I have shown but one embodiment of my invention for the purpose of describing the same and illustrating its construction and arrangement, it is apparent that various changes and modifications may be made therein without departing from the spirit of my invention, and I desire, there: fore, that only such limitations shall be imposed thereon as are indicated by the appended claims or demanded by the prior art.

' I claim as my invention:

1. A cabinet, a control panel constituting one of the containing walls thereof, electrical apparatus carried by said panel, said cabinet. having perforations in one of the remaining walls thereof, and terminal connectors for said apparatus mounted within said cabinet and having substantially free ends extending through said perforations to admit of access thereto from the outside of said cabinet. 7

2. A cabinet, a supporting panel constituting one of the containing walls thereof, electrical apparatus carried by said panel and disposed within said cabinet, said cabinet having perforations in one of the remaining walls thereof, and terminal connections for said apparatus carried by said panel and having substantially free ends disposed adjacent to said perforations to admit of access thereto from the outside of said cabinet.

3. A cabinet, a control panel constituting one of the containing walls thereof, electrical appa'atus carried by said panel, said cabinet having perforations in an opposite wall, and terminal connectors for said apparatus carried by said panel and having substantially free ends extending through said perforations to admit of access thereto.

a. A cabinet open at one face and provided with perforations at an opposite face, a control panel constituting a covering for said open end, and a plurality of rods carried by said panel and extending through said perforations to provide circuit terminal connections.

5. The combination with a cabinet, of a main control panel constituting one of the containing walls thereof, said cabinet having a perforation in one of the remaining walls thereof, a sub-panel supported from the inside surface of saidmain panel and a rigid terminal connector carried by said sub-panel and extending from said cabinet through said perforation to admit of access thereto from the outside of said cabinet.

6. l he combination with a cabinet, of a removably mounted control panel constituting one of the containing walls thereof, said cabinet having a perforation in one of the remaining walls thereof, a sub-panel carried by said main panel, and a rigid terminal connector secured to said sub-panel and extend ing from said cabinet through said perforation to admit of access thereto from the outside of said cabinet.

'5. A cabinet open in front and having perforations in the rear wall, the principal con tents of the cabinet being mounted as a removable unit comprising an outer control panel serving as a front closure for the cabinet, a sub-panel supported in spaced relation from the rear surface of said control panel, translating apparatus disposed both in front of and behind said sub-panel and supported thereby, and rigid terminal conductors supported by said sub-panel andeX- tending adjacent to the perforations in the rea r wall to admit of access from the outside of the cabinet.

8. A radio-receiving set comprising a cabi net open in front, the rear wall of the cabinet being provided with perforations, and a removable unit comprising an outer control panel serving as a front closure for the cabinet, a sub-panel supported in spaced relation from the rear surface of said control panel, receiving apparatus supported by said sub panel, said receiving apparatus comprising two variable reactors disposed upon opposite sides of said sub-panel and mounted upon a common actuating shaft, and rigid terminal connectors supported by said sub-panel and extending adjacent to the perforations in the rear wall to admit of access fromthe outside of the cabinet.

In testimony whereof, I have hereunto subscribed my name this 22nd day of August,

' DONALD G. LITTLE. 

